wventura, what I said is that white Latin Americans don't identify themselves as being part of any Spanish "diaspora" and neither do black Latin Americans identify themselves as part of any African "diaspora". That is a concept developed in the US and embraced by many or some black Americans. I have said I am not that familiar with Dominicans. I would guess that the majority know they are a mixture of African, European and some native genes. If it is so obvious then there is no point in either admitting it or denying it, it's there for everyone to see. Maybe they just take it for granted as well. I have read that in the official DR census, when they used to record a person's race, there were four categories: White, Black, Mestizo(Mulatto) and Asian. And most of the population was classified as mulato. That means they recognized their dual- or triple if taino genes are included- ancestry. Mulatoes in the DR do tend to use the word "indio" to identify their color, like someone else previously stated here. That word is also applied to mulatoes who have straight hair and that type of coloring. However, almost anything in the DR is a mixture, from merengue to food to religious beliefs. That mixture is black, white and indian or European/Caucasian, African Negro and Native- a branch of the Mongoloid race. Not all the Caucasian heritage is Spanish, there is French, Lebanese/Syrian/Jewish(Semitic), Italian etc. In addition, the modern Mongoloid presence is represented by the Chinese communities which exist in major cities.
Because of all of these mixtures and the history of the country, you can say that there are no pure races in the DR, but that is also the situation in the world at large. I seriously doubt that black Dominicans don't know they are black, and I mean the ones who are obviouly of predominantly black African ancestry. Perhaps because they don't want to be mistaken for Haitians, they mention whatever Spanish ancestor they may have. What they are problably saying is that even thoug they are black, they are Dominican.
Now, in the same way that the most African looking Dominican blacks may have inherited some white genes from a remote white or mulato ancestor, the whitest of Dominicans- like the upper class folks- may also have inherited some black genes from some remote black or mulato ancestor. That is a reality which is not limited to the DR.
Now, even in Haiti, which is acknowledged as being the first black republic and the first country to become independent in the region and where African ancestry is not only accepted but proudly claimed, there are differences between the light skinned mulato elite and the majority of the population. Even in Haiti being "pretty" or upper class etc. is associated with whiteness.
It is also, perhaps, because of Haiti being so African in racial heritage, that Dominicans, in order to claim their own identy as a people separate from Haiti, put comparatively more emphasis on their Spanish heritage. Besides, culturally speaking as well, the DR is more Spanish than Haiti is French. Haiti is more African, in fact the most African country in the Americas, and Dominicans are well aware of it. Those facts may help to explain the attitudes you are complaining about on the part of Dominicans.